一种自动识别伪根的双端故障测距快速精确算法  

Fast and Accuracy Algorithm for Dual-terminal Fault Location with Automatic False Root Identification for HV Transmission Line

作　　者：王忠[1] 刘奎[1] 陆金凤[1] 沈军[1] 赵青春[1] 

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《江苏电机工程》2016年第6期36-41,共6页Jiangsu Electrical Engineering

摘　　要：针对双端数据不同步的测距算法中存在的伪根判断、收敛性、计算量大等问题,提出了一种快速精确的双端测距算法。此算法基于线路分布参数模型,通过分析高压输电线路电压幅值曲线的单调性和周期性,在迭代过程中根据故障点电压变化趋势自动对伪根进行识别,从而确定下一次搜索的方向,采用二分法快速求出故障点的位置。算法实现简单,计算量小,不要求双端数据同步,能消除过渡电阻的影响,具有较高的实用价值。经过PSCAD仿真证明,此算法克服了以往算法的不足,计算速度快,精度高,解决了快速性和伪根判决的矛盾。To solve the problems such as false root judgment, astringency, high computation cost and so on, which exist in asynchronous dual-terminal fault location algorithms, this paper presents a new fast and accuracy dual-terminal fault location algorithm for HV transmission line. Based on the line distributed parameters and the analysis of the monotonicity and periodicity of HV transmission line＇s voltage amplitude curve, it automatically identifies the false root according to the variation tendency of fault point＇s voltage in the process of iterations, so that the next search direction can be determined. Then the fault point is rapidly located by dichotomy. This algorithm is simple with minor calculation. It also doesn＇t require synchronous dual-terminal data and can eliminate the influence of transition resistance. So it has a high practical value. The simulation results of PSCAD show that it overcomes deficiency of the former algorithms and has high accuracy and quick computation speed, resolving the contradiction between rapidity and false root judgment.

关 键 词：故障测距 双端数据不同步 二分搜索法 分布式参数 高压输电线路 

分 类 号：TM77[电气工程—电力系统及自动化]